Oscillating device with two oscillating masses adapted periodically to approach each other and to recede from each other



Apnl 17, 1956 w. F. KLUGE 2,741,926

OSCILLATING DEVICE WITH TWO OSCILLATING MASSES ADAPTED PERIODICALLY TOAPPROACH EACH OTHER AND TO RECEDE FROM EACH OTHER Filed July 27, 1951Invenzor':

WIU-IELM F2 uwae flt-torneys United States Patefit OSCILLATING DEVICEWITH TWO OSCILLATING MASSES ADAPTED PERIODICALLY TO A1- PROACH EACHOTHER AND TO RECEDEFROM EACH OTHER Wilhelm F. Kluge, Essen, Germany,assignor to Fried.

Krupp Stahlbau Rheinhausen, Rheinhausen-Niederrhein, Germany vApplication July 27, 1951, Serial N5. 238,979

Claims priority, application Germany August 5, 1950 g s cl: 74-87 Thepresent invention relates to oscillating device with two oscillatingmasses periodically approaching each other and receding from each other.,Moreparticularly, the invention relates'to a device of this type, inwhich one mass 'is represented by the working mass, whereas the'ot'he'rmass, actingas counterbalancing mass, is represented by the supportingname, while driving means are provided in the cement" gr'av'itfcoinmonto the said two masses. According to this invention, the driving meansincludes unbalanced rna'ss tl1'a,tiriitia'tes'and sustains oscillationor vibration of the working mass and supportin'g'mas'si According to aknowdoscillating sifting device of the general type involved, thedriving'means, and which includesan unbalancedm'ass, is arranged at thesifting box, or working ina'ss', whichl'atter; by means of inclinedconnecting rods is" 'jo'u'rnaled in' the supporting frame, orcounterbalancing mass, was to be able to oscillate.

It has also been suggested, prior to this' invention, to provideyielding power'storing means, such as springs or rubber shock absorbersbetween the said two masses, and by means of the said'power storingmeans to produce 'counterrunning oscillations.

It is an object of the present invention to improve the heretofore knowndevices of the type referred to above in order to require-onlyrelatively small accelerating forces for actuating the working mass.

It is a further object of this invention to provide an oscillatingdevice with two counter-oscillating masses,

i. e., masses which periodically approach each other and recede fromeach other, in which themass located at the working frame is as small-aspossible, while the mass formed by the supporting frame is as heavyas possible. I I

This distribution of mass between the working frame and thesupportingtframefis advantageous because the amplitudes of oscillationof the two masses are invariably reciprocal to their weights, thelighter working frame mass thus 'showing' 'a large,"and -the heaviersupporting frame mass a smaller amplitude; and, the smaller theamplitude of oscillation of the supporting frame, which in turn isyieldably supported by means of springs on the foundation plate, thelessare the'oscillatingfor'ces effecting the foundation of the machine.

It is my discovery that,fif 'an"oscillating device is to be driven bymeans of rotating unbalances the axis of rotation of the driving elementmust be disposed in the center of gravity of the'entire device, ix'e'.the center of gravity of all"mas sejs'"of "thedevic'e coinbiii'edl Onlythen is itpossible 'tb avoid" 'tha't'a' lever 'eiiecfoccurs due to thedistance between the driving element and the center'ofgravity"of"thetotal' of the -device, which lever elfect iiiay leadto'rocking-or tilting movements of the'de'vlce. v

r 2,741,926 l atented Apr. 17, s

General arrangement in an effort to keep the mass at the sieve frame aslight as possible, while keeping the mass formed by the supporting frameas heavy as possible, the drive for the oscillating masses is, accordingto the present invention, likewise arranged in the center of gravity ofthe combined oscillating masses; but in contrast to the heretofore knowndevices of the type involved, the driving means is arranged at andsupported by the supporting frame. Since, thus the rather considerableweight of the driving means is deducted from the mass located at thesieve frame, and, on the other hand, is added to the weight of thesupporting frame, the great advantage is obtained that only smallaccelerating forces are required for driving the working mass (sieveframe), such as the mass effecting the sifting or'conveying operation.

Furthermore, with this arrangement, the stresses of the material of thismass are materially reduced when considering the same oscillatingamplitude. In conformity with the. ratio of the weights of the massesacting against each other, i. e., of the working mass on one hand andthe counterbalancing mass represented by the supporting frame on theother hand, an oscillating amplitude for the counterbalancing mass isobtained, which, with the weight distribution mentioned above, ismaterially less than the oscillating amplitude of the working mass.Consequently, also the accelerating forces for the counterbalancing massare correspondingly low.

The low weight of the working mass results in a further importantadvantage. The dimensioning and construction of the power storing meansarrangedbetween the two masses is primarily dependent on the weight ofthe working mass. These power storing means may consist of springs,rubber cushions or rubber shock absorbers. If the working mass is of'arelatively greater weight, preferably a series of rubber shock absorbingmeans is provided.

In many instances, in order to produce pseudo-harmonic oscillations,shock absorbing means are provided, which for the first part of theoscillating movement have a linear spring characteristic, and after apredetermined oscilating amplitude have a nonlinear springcharacteristic. The construction of such shock absorbing means becomessimpler the less weight the working mass will have. According to thepresent invention, rubber shock absorbing means are employed which areso constructed that during the first portion of the oscillatingmovement, the forces act only on a portion of their cross-section, whileonly after the shock absorbing means have been compressed to apredetermined extent, the forces act on the entire cross-section of therubber shock absorbing means.

These and other objects and advantages of the invention will appear moreclearly from the following description of the accompanying drawing inwhich:

Figure 1 diagrammatically illustrates a side view of an oscillatingdevice according to the present invention; and

Figure 2 is a plan view looking down on Figure 1;

Figure 3 is a side view on an enlarged scale of the shock absorbingmeans used in an oscillating device according to the invention.

Structural arrangement Referring now-to the drawings in detail, thestructure shown therein comprises 'a supporting frame 1 having thecentei' of *gravity C, which is yieldably supported by means of springs2. Supported by the supporting frame 1 by means of inclined connectingrods or leaf springs 3, is a sifting box 4 having the center of gravityA. On each side of the supporting frame 1 there are arranged twotraverses 5 which extend in the oscillating direction of the siftingbox, i. e., perpendicular to the connecting means 3. Each of thesetraverses 5 is provided with a window-like cut-out portion 6.

Arranged inside the cut-out portions 6 at those sur faces thereof whichface each other in the oscillating direction of the sitting box 4, arerubber buffers or shock absorbing means 7 and 8. These buffers or shockabsorbing means 7 and 8 are arranged in pairs, and each pair at leastpartly embraces a portion of a cross piece 9 which is connected with thesifting box 4. Since the weight of the sifting box 4 is partiallysupported by the buffers or shock absorbing means 7, these buffers orshock absorbing means are made correspondingly stronger, whilemaintaining the desired spring characteristic.

In the center of gravity B of the combined counter oscillating massesthere is arranged the driving means 10 mounted in journals 100 on thelower frame 1, which is constructed as the driving means for the device.

This driving means comprises the driven shaft 13 belted or otherwisedrivingly connected to drive motor 14. One or more eccentricallypositioned masses, at 15, provide for the vibratory movement desiredwhen shaft 13 is driven.

The rubber buffers or shock absorbing means 7 and 8, when viewed in theoscillating direction, have two different effective cross-sections a andb. When these buffers or shock absorbing means are at rest and alsoduring a predetermined oscillating movement on the device, only thenose-like protruding parts 11 of small cross-section abut the crosspiece 9. However, during the remaining part of the oscillating movement,the additional crosssection portions of the buffers or shock absorbingmeans, i. e., those lateral annular portions 12, which are receding withregard to the central protruding portions 11 having the larger crosssection b, abut the cross piece 9.

It will be understood that this invention is susceptible to modificationin order to adapt it to different usages and conditions, and,accordingly, it is desired to comprehend such modifications within thisinvention as may fall within the scope of the appended claims.

I claim:

1. In combination in an oscillating device with two counter-oscillatingmasses, one above the other, one of these masses forming the workingmass and the other one representing a frame supporting said working massand being arranged to oscillate vertically and horizontally, and drivingmeans for causing oscillation of said masses, said driving means,comprising a rotatable shaft and unbalanced mass carried thereby, saiddriving means being mounted on said supporting frame and located in thecenter of gravity of the combined masses and on said supporting frame.

2. In combination in an oscillating device with two counter-oscillatingmasses, one above the other, one of these masses being a working massand the other one being a frame supporting said working mass and beingarranged to oscillate vertically and horizontally, resilient meansinterposed between said two counterrunning masses and adapted to becompressed by these masses upon rela tive movement of the masses towardeach other, said resilient means having alternate portions of twodifferent cross sections causing two different spring effectssuccessively effective during a complete stroke of the masses towardeach other, and driving means comprising a rotatable shaft andunbalanced mass carried thereby for causing oscillation of said massesand located both on said supporting frame and in the center of gravityof the combined masses when stationary.

3. In combination in an oscillating device with two counter-oscillatingmasses, one above the other, one of these masses being a working massand the other one being a frame supporting said working mass and beingarranged to oscillate vertically and horizontally, resilient rubbermembers interposed between said two masses and adapted to be compressedby these masses upon movement of the masses toward each other, each ofsaid resilient rubber members having several portions of at least twodifferent cross-sections arranged to become successively effectiveduring a complete stroke of the masses toward each other, and drivingmeans for causing oscillation of said masses being mounted on saidsupporting frame and located at the center of gravity of the combinedmasses when the latter are stationary, said driving means comprising arotatable shaft and unbalanced mass carried thereby.

4. In combination in an oscillating device, a first oscillating massformed by a working mass and lying substantially horizontal, a secondoscillating mass representing the counterbalancing mass and being alsohorizontal and spaced beneath the working mass and formed by asupporting frame, means resilient in the vertical direction supportingthe frame and flexible in a horizontal plane, rigid link means extendingangularly between said masses and pivoted thereto so said first and saidsecond masses when oscillated will periodically approach each other andrecede from each other, a plurality of resilient rubber membersinterposed in distributed relation between said first and said secondmasses resilient in the direction of relative oscillation of said massesand adapted to be compressed by said oscillating masses, each of saidresilient rubber members having portions of at least two differentcross-sectional areas distributed therealong in the direction ofcompression of the member and thus arranged to become successivelyeffective in determining the spring effect of said members during acomplete compression stroke, and driving means for causing relativeoscillation of said masses said driving means being located in a planethat passes through the individual centers of gravity of said masses andin the center of gravity of the combined masses when at rest, saiddriving means being mounted on said supporting frame, and comprising arotatable shaft and unbalanced mass carried thereby, said first andsecond masses being so arranged that said plane is substantiallyperpendicular to said link means.

5. In combination in an oscillating device, a first oscillating massformed by a working mass and lying substantially horizontal, a secondoscillating mass representing the counterbalancing mass and being alsohorizontal and spaced beneath the working mass and formed by asupporting frame, means resilient in the vertical direction supportingthe frame and flexible in a horizontal plane, rigid link means extendingangularly between said masses and pivoted thereto so said first and saidsecond masses when oscillated will periodically approach each other andrecede from each other, a plurality of resilient rubber membersinterposed'in distributed relation between said first and said secondmasses resilient in the direction of relative oscillation of said massesand adapted to be compressed by said oscillating masses, each of saidresilient rubber members having portions of at least two differentcross-sectional areas distributed therealong in the direction ofcompression of the member and thus arranged to become successivelyeffective in determining the spring effect of said members during acomplete compression stroke, and driving means for causing relativeoscillation of said masses, said driving means being located in a planethat passes through the individual centers of gravity of said masses andin the center of gravity of the combined masses when at rest, saiddriving means being mounted on said supporting frame, and comprising arotatable shaft and unbalanced mass carried thereby, said first andsecond masses being so arranged that said plane is substantiallyperpendicular to said link means, a stationarily mounted motor fordriving said driving means, and means References Cited in the file ofthis patent 5 UNITED STATES PATENTS Bradley Dec. 20, 1910 JacquelinMay27, 1924 Binte July 1,. 1930 Merz Aug. 25, 1931 Heymann May 11, 19376 Schieferstein Apr. 11, 1939 Weyandt Ian. 23, 1940 Brown Aug. 13, .1940Wolz Feb. 4, 1941 Linke Sept. 29,1942

FOREIGN PATENTS l Germany Jan. 22, 1934 Germany July 22, 1937 GreatBritain May 13, 1953 Germany Sept. 30, 1942

